/**
 * \file cmac.c
 *
 * \brief NIST SP800-38B compliant CMAC implementation for AES and 3DES
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 *
 *  This file is provided under the Apache License 2.0, or the
 *  GNU General Public License v2.0 or later.
 *
 *  **********
 *  Apache License 2.0:
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  **********
 *
 *  **********
 *  GNU General Public License v2.0 or later:
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *  **********
 */

/*
 * References:
 *
 * - NIST SP 800-38B Recommendation for Block Cipher Modes of Operation: The
 *      CMAC Mode for Authentication
 *   http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-38b.pdf
 *
 * - RFC 4493 - The AES-CMAC Algorithm
 *   https://tools.ietf.org/html/rfc4493
 *
 * - RFC 4615 - The Advanced Encryption Standard-Cipher-based Message
 *      Authentication Code-Pseudo-Random Function-128 (AES-CMAC-PRF-128)
 *      Algorithm for the Internet Key Exchange Protocol (IKE)
 *   https://tools.ietf.org/html/rfc4615
 *
 *   Additional test vectors: ISO/IEC 9797-1
 *
 */

#if !defined(MBEDTLS_CONFIG_FILE)
#include "nettls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_CMAC_C)

#include "nettls/cmac.h"
#include "nettls/platform_util.h"

#include <string.h>

#if defined(MBEDTLS_PLATFORM_C)
#include "nettls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc calloc
#define mbedtls_free   free
#if defined(MBEDTLS_SELF_TEST)
#include <stdio.h>
#define mbedtls_printf printf
#endif /* MBEDTLS_SELF_TEST */
#endif /* MBEDTLS_PLATFORM_C */

#if !defined(MBEDTLS_CMAC_ALT) || defined(MBEDTLS_SELF_TEST)

/*
 * Multiplication by u in the Galois field of GF(2^n)
 *
 * As explained in NIST SP 800-38B, this can be computed:
 *
 *   If MSB(p) = 0, then p = (p << 1)
 *   If MSB(p) = 1, then p = (p << 1) ^ R_n
 *   with R_64 = 0x1B and  R_128 = 0x87
 *
 * Input and output MUST NOT point to the same buffer
 * Block size must be 8 bytes or 16 bytes - the block sizes for DES and AES.
 */
static int cmac_multiply_by_u(unsigned char* output, const unsigned char* input, size_t blocksize)
{
    const unsigned char R_128 = 0x87;
    const unsigned char R_64 = 0x1B;
    unsigned char R_n, mask;
    unsigned char overflow = 0x00;
    int i;

    if (blocksize == MBEDTLS_AES_BLOCK_SIZE) {
        R_n = R_128;
    } else if (blocksize == MBEDTLS_DES3_BLOCK_SIZE) {
        R_n = R_64;
    } else {
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
    }

    for (i = (int)blocksize - 1; i >= 0; i--) {
        output[i] = input[i] << 1 | overflow;
        overflow = input[i] >> 7;
    }

    /* mask = ( input[0] >> 7 ) ? 0xff : 0x00
     * using bit operations to avoid branches */

    /* MSVC has a warning about unary minus on unsigned, but this is
     * well-defined and precisely what we want to do here */
#if defined(_MSC_VER)
#pragma warning(push)
#pragma warning(disable : 4146)
#endif
    mask = -(input[0] >> 7);
#if defined(_MSC_VER)
#pragma warning(pop)
#endif

    output[blocksize - 1] ^= R_n & mask;

    return (0);
}

/*
 * Generate subkeys
 *
 * - as specified by RFC 4493, section 2.3 Subkey Generation Algorithm
 */
static int cmac_generate_subkeys(mbedtls_cipher_context_t* ctx, unsigned char* K1, unsigned char* K2)
{
    int ret;
    unsigned char L[MBEDTLS_CIPHER_BLKSIZE_MAX];
    size_t olen, block_size;

    mbedtls_platform_zeroize(L, sizeof(L));

    block_size = ctx->cipher_info->block_size;

    /* Calculate Ek(0) */
    if ((ret = mbedtls_cipher_update(ctx, L, block_size, L, &olen)) != 0)
        goto exit;

    /*
     * Generate K1 and K2
     */
    if ((ret = cmac_multiply_by_u(K1, L, block_size)) != 0)
        goto exit;

    if ((ret = cmac_multiply_by_u(K2, K1, block_size)) != 0)
        goto exit;

exit:
    mbedtls_platform_zeroize(L, sizeof(L));

    return (ret);
}
#endif /* !defined(MBEDTLS_CMAC_ALT) || defined(MBEDTLS_SELF_TEST) */

#if !defined(MBEDTLS_CMAC_ALT)
static void cmac_xor_block(unsigned char* output, const unsigned char* input1, const unsigned char* input2, const size_t block_size)
{
    size_t idx;

    for (idx = 0; idx < block_size; idx++)
        output[idx] = input1[idx] ^ input2[idx];
}

/*
 * Create padded last block from (partial) last block.
 *
 * We can't use the padding option from the cipher layer, as it only works for
 * CBC and we use ECB mode, and anyway we need to XOR K1 or K2 in addition.
 */
static void
    cmac_pad(unsigned char padded_block[MBEDTLS_CIPHER_BLKSIZE_MAX], size_t padded_block_len, const unsigned char* last_block, size_t last_block_len)
{
    size_t j;

    for (j = 0; j < padded_block_len; j++) {
        if (j < last_block_len)
            padded_block[j] = last_block[j];
        else if (j == last_block_len)
            padded_block[j] = 0x80;
        else
            padded_block[j] = 0x00;
    }
}

int mbedtls_cipher_cmac_starts(mbedtls_cipher_context_t* ctx, const unsigned char* key, size_t keybits)
{
    mbedtls_cipher_type_t type;
    mbedtls_cmac_context_t* cmac_ctx;
    int retval;

    if (ctx == NULL || ctx->cipher_info == NULL || key == NULL)
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);

    if ((retval = mbedtls_cipher_setkey(ctx, key, (int)keybits, MBEDTLS_ENCRYPT)) != 0)
        return (retval);

    type = ctx->cipher_info->type;

    switch (type) {
    case MBEDTLS_CIPHER_AES_128_ECB:
    case MBEDTLS_CIPHER_AES_192_ECB:
    case MBEDTLS_CIPHER_AES_256_ECB:
    case MBEDTLS_CIPHER_DES_EDE3_ECB:
        break;
    default:
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);
    }

    /* Allocated and initialise in the cipher context memory for the CMAC
     * context */
    cmac_ctx = mbedtls_calloc(1, sizeof(mbedtls_cmac_context_t));
    if (cmac_ctx == NULL)
        return (MBEDTLS_ERR_CIPHER_ALLOC_FAILED);

    ctx->cmac_ctx = cmac_ctx;

    mbedtls_platform_zeroize(cmac_ctx->state, sizeof(cmac_ctx->state));

    return 0;
}

int mbedtls_cipher_cmac_update(mbedtls_cipher_context_t* ctx, const unsigned char* input, size_t ilen)
{
    mbedtls_cmac_context_t* cmac_ctx;
    unsigned char* state;
    int ret = 0;
    size_t n, j, olen, block_size;

    if (ctx == NULL || ctx->cipher_info == NULL || input == NULL || ctx->cmac_ctx == NULL)
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);

    cmac_ctx = ctx->cmac_ctx;
    block_size = ctx->cipher_info->block_size;
    state = ctx->cmac_ctx->state;

    /* Is there data still to process from the last call, that's greater in
     * size than a block? */
    if (cmac_ctx->unprocessed_len > 0 && ilen > block_size - cmac_ctx->unprocessed_len) {
        memcpy(&cmac_ctx->unprocessed_block[cmac_ctx->unprocessed_len], input, block_size - cmac_ctx->unprocessed_len);

        cmac_xor_block(state, cmac_ctx->unprocessed_block, state, block_size);

        if ((ret = mbedtls_cipher_update(ctx, state, block_size, state, &olen)) != 0) {
            goto exit;
        }

        input += block_size - cmac_ctx->unprocessed_len;
        ilen -= block_size - cmac_ctx->unprocessed_len;
        cmac_ctx->unprocessed_len = 0;
    }

    /* n is the number of blocks including any final partial block */
    n = (ilen + block_size - 1) / block_size;

    /* Iterate across the input data in block sized chunks, excluding any
     * final partial or complete block */
    for (j = 1; j < n; j++) {
        cmac_xor_block(state, input, state, block_size);

        if ((ret = mbedtls_cipher_update(ctx, state, block_size, state, &olen)) != 0)
            goto exit;

        ilen -= block_size;
        input += block_size;
    }

    /* If there is data left over that wasn't aligned to a block */
    if (ilen > 0) {
        memcpy(&cmac_ctx->unprocessed_block[cmac_ctx->unprocessed_len], input, ilen);
        cmac_ctx->unprocessed_len += ilen;
    }

exit:
    return (ret);
}

int mbedtls_cipher_cmac_finish(mbedtls_cipher_context_t* ctx, unsigned char* output)
{
    mbedtls_cmac_context_t* cmac_ctx;
    unsigned char *state, *last_block;
    unsigned char K1[MBEDTLS_CIPHER_BLKSIZE_MAX];
    unsigned char K2[MBEDTLS_CIPHER_BLKSIZE_MAX];
    unsigned char M_last[MBEDTLS_CIPHER_BLKSIZE_MAX];
    int ret;
    size_t olen, block_size;

    if (ctx == NULL || ctx->cipher_info == NULL || ctx->cmac_ctx == NULL || output == NULL)
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);

    cmac_ctx = ctx->cmac_ctx;
    block_size = ctx->cipher_info->block_size;
    state = cmac_ctx->state;

    mbedtls_platform_zeroize(K1, sizeof(K1));
    mbedtls_platform_zeroize(K2, sizeof(K2));
    cmac_generate_subkeys(ctx, K1, K2);

    last_block = cmac_ctx->unprocessed_block;

    /* Calculate last block */
    if (cmac_ctx->unprocessed_len < block_size) {
        cmac_pad(M_last, block_size, last_block, cmac_ctx->unprocessed_len);
        cmac_xor_block(M_last, M_last, K2, block_size);
    } else {
        /* Last block is complete block */
        cmac_xor_block(M_last, last_block, K1, block_size);
    }

    cmac_xor_block(state, M_last, state, block_size);
    if ((ret = mbedtls_cipher_update(ctx, state, block_size, state, &olen)) != 0) {
        goto exit;
    }

    memcpy(output, state, block_size);

exit:
    /* Wipe the generated keys on the stack, and any other transients to avoid
     * side channel leakage */
    mbedtls_platform_zeroize(K1, sizeof(K1));
    mbedtls_platform_zeroize(K2, sizeof(K2));

    cmac_ctx->unprocessed_len = 0;
    mbedtls_platform_zeroize(cmac_ctx->unprocessed_block, sizeof(cmac_ctx->unprocessed_block));

    mbedtls_platform_zeroize(state, MBEDTLS_CIPHER_BLKSIZE_MAX);
    return (ret);
}

int mbedtls_cipher_cmac_reset(mbedtls_cipher_context_t* ctx)
{
    mbedtls_cmac_context_t* cmac_ctx;

    if (ctx == NULL || ctx->cipher_info == NULL || ctx->cmac_ctx == NULL)
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);

    cmac_ctx = ctx->cmac_ctx;

    /* Reset the internal state */
    cmac_ctx->unprocessed_len = 0;
    mbedtls_platform_zeroize(cmac_ctx->unprocessed_block, sizeof(cmac_ctx->unprocessed_block));
    mbedtls_platform_zeroize(cmac_ctx->state, sizeof(cmac_ctx->state));

    return (0);
}

int mbedtls_cipher_cmac(
    const mbedtls_cipher_info_t* cipher_info, const unsigned char* key, size_t keylen, const unsigned char* input, size_t ilen, unsigned char* output)
{
    mbedtls_cipher_context_t ctx;
    int ret;

    if (cipher_info == NULL || key == NULL || input == NULL || output == NULL)
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);

    mbedtls_cipher_init(&ctx);

    if ((ret = mbedtls_cipher_setup(&ctx, cipher_info)) != 0)
        goto exit;

    ret = mbedtls_cipher_cmac_starts(&ctx, key, keylen);
    if (ret != 0)
        goto exit;

    ret = mbedtls_cipher_cmac_update(&ctx, input, ilen);
    if (ret != 0)
        goto exit;

    ret = mbedtls_cipher_cmac_finish(&ctx, output);

exit:
    mbedtls_cipher_free(&ctx);

    return (ret);
}

#if defined(MBEDTLS_AES_C)
/*
 * Implementation of AES-CMAC-PRF-128 defined in RFC 4615
 */
int mbedtls_aes_cmac_prf_128(const unsigned char* key, size_t key_length, const unsigned char* input, size_t in_len, unsigned char output[16])
{
    int ret;
    const mbedtls_cipher_info_t* cipher_info;
    unsigned char zero_key[MBEDTLS_AES_BLOCK_SIZE];
    unsigned char int_key[MBEDTLS_AES_BLOCK_SIZE];

    if (key == NULL || input == NULL || output == NULL)
        return (MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA);

    cipher_info = mbedtls_cipher_info_from_type(MBEDTLS_CIPHER_AES_128_ECB);
    if (cipher_info == NULL) {
        /* Failing at this point must be due to a build issue */
        ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
        goto exit;
    }

    if (key_length == MBEDTLS_AES_BLOCK_SIZE) {
        /* Use key as is */
        memcpy(int_key, key, MBEDTLS_AES_BLOCK_SIZE);
    } else {
        memset(zero_key, 0, MBEDTLS_AES_BLOCK_SIZE);

        ret = mbedtls_cipher_cmac(cipher_info, zero_key, 128, key, key_length, int_key);
        if (ret != 0)
            goto exit;
    }

    ret = mbedtls_cipher_cmac(cipher_info, int_key, 128, input, in_len, output);

exit:
    mbedtls_platform_zeroize(int_key, sizeof(int_key));

    return (ret);
}
#endif /* MBEDTLS_AES_C */

#endif /* !MBEDTLS_CMAC_ALT */

#if defined(MBEDTLS_SELF_TEST)
/*
 * CMAC test data for SP800-38B
 * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/AES_CMAC.pdf
 * http://csrc.nist.gov/groups/ST/toolkit/documents/Examples/TDES_CMAC.pdf
 *
 * AES-CMAC-PRF-128 test data from RFC 4615
 * https://tools.ietf.org/html/rfc4615#page-4
 */

#define NB_CMAC_TESTS_PER_KEY 4
#define NB_PRF_TESTS          3

#if defined(MBEDTLS_AES_C) || defined(MBEDTLS_DES_C)
/* All CMAC test inputs are truncated from the same 64 byte buffer. */
static const unsigned char test_message[] = {
    /* PT */
    0x6b, 0xc1, 0xbe, 0xe2, 0x2e, 0x40, 0x9f, 0x96, 0xe9, 0x3d, 0x7e, 0x11, 0x73, 0x93, 0x17, 0x2a, 0xae, 0x2d, 0x8a, 0x57, 0x1e, 0x03,
    0xac, 0x9c, 0x9e, 0xb7, 0x6f, 0xac, 0x45, 0xaf, 0x8e, 0x51, 0x30, 0xc8, 0x1c, 0x46, 0xa3, 0x5c, 0xe4, 0x11, 0xe5, 0xfb, 0xc1, 0x19,
    0x1a, 0x0a, 0x52, 0xef, 0xf6, 0x9f, 0x24, 0x45, 0xdf, 0x4f, 0x9b, 0x17, 0xad, 0x2b, 0x41, 0x7b, 0xe6, 0x6c, 0x37, 0x10};
#endif /* MBEDTLS_AES_C || MBEDTLS_DES_C */

#if defined(MBEDTLS_AES_C)
/* Truncation point of message for AES CMAC tests  */
static const unsigned int aes_message_lengths[NB_CMAC_TESTS_PER_KEY] = {
    /* Mlen */
    0, 16, 20, 64};

/* CMAC-AES128 Test Data */
static const unsigned char aes_128_key[16] = {0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c};
static const unsigned char aes_128_subkeys[2][MBEDTLS_AES_BLOCK_SIZE] = {
    {/* K1 */
     0xfb, 0xee, 0xd6, 0x18, 0x35, 0x71, 0x33, 0x66, 0x7c, 0x85, 0xe0, 0x8f, 0x72, 0x36, 0xa8, 0xde},
    {/* K2 */
     0xf7, 0xdd, 0xac, 0x30, 0x6a, 0xe2, 0x66, 0xcc, 0xf9, 0x0b, 0xc1, 0x1e, 0xe4, 0x6d, 0x51, 0x3b}};
static const unsigned char aes_128_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_AES_BLOCK_SIZE] = {
    {/* Example #1 */
     0xbb, 0x1d, 0x69, 0x29, 0xe9, 0x59, 0x37, 0x28, 0x7f, 0xa3, 0x7d, 0x12, 0x9b, 0x75, 0x67, 0x46},
    {/* Example #2 */
     0x07, 0x0a, 0x16, 0xb4, 0x6b, 0x4d, 0x41, 0x44, 0xf7, 0x9b, 0xdd, 0x9d, 0xd0, 0x4a, 0x28, 0x7c},
    {/* Example #3 */
     0x7d, 0x85, 0x44, 0x9e, 0xa6, 0xea, 0x19, 0xc8, 0x23, 0xa7, 0xbf, 0x78, 0x83, 0x7d, 0xfa, 0xde},
    {/* Example #4 */
     0x51, 0xf0, 0xbe, 0xbf, 0x7e, 0x3b, 0x9d, 0x92, 0xfc, 0x49, 0x74, 0x17, 0x79, 0x36, 0x3c, 0xfe}};

/* CMAC-AES192 Test Data */
static const unsigned char aes_192_key[24] = {0x8e, 0x73, 0xb0, 0xf7, 0xda, 0x0e, 0x64, 0x52, 0xc8, 0x10, 0xf3, 0x2b,
                                              0x80, 0x90, 0x79, 0xe5, 0x62, 0xf8, 0xea, 0xd2, 0x52, 0x2c, 0x6b, 0x7b};
static const unsigned char aes_192_subkeys[2][MBEDTLS_AES_BLOCK_SIZE] = {
    {/* K1 */
     0x44, 0x8a, 0x5b, 0x1c, 0x93, 0x51, 0x4b, 0x27, 0x3e, 0xe6, 0x43, 0x9d, 0xd4, 0xda, 0xa2, 0x96},
    {/* K2 */
     0x89, 0x14, 0xb6, 0x39, 0x26, 0xa2, 0x96, 0x4e, 0x7d, 0xcc, 0x87, 0x3b, 0xa9, 0xb5, 0x45, 0x2c}};
static const unsigned char aes_192_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_AES_BLOCK_SIZE] = {
    {/* Example #1 */
     0xd1, 0x7d, 0xdf, 0x46, 0xad, 0xaa, 0xcd, 0xe5, 0x31, 0xca, 0xc4, 0x83, 0xde, 0x7a, 0x93, 0x67},
    {/* Example #2 */
     0x9e, 0x99, 0xa7, 0xbf, 0x31, 0xe7, 0x10, 0x90, 0x06, 0x62, 0xf6, 0x5e, 0x61, 0x7c, 0x51, 0x84},
    {/* Example #3 */
     0x3d, 0x75, 0xc1, 0x94, 0xed, 0x96, 0x07, 0x04, 0x44, 0xa9, 0xfa, 0x7e, 0xc7, 0x40, 0xec, 0xf8},
    {/* Example #4 */
     0xa1, 0xd5, 0xdf, 0x0e, 0xed, 0x79, 0x0f, 0x79, 0x4d, 0x77, 0x58, 0x96, 0x59, 0xf3, 0x9a, 0x11}};

/* CMAC-AES256 Test Data */
static const unsigned char aes_256_key[32] = {0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
                                              0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4};
static const unsigned char aes_256_subkeys[2][MBEDTLS_AES_BLOCK_SIZE] = {
    {/* K1 */
     0xca, 0xd1, 0xed, 0x03, 0x29, 0x9e, 0xed, 0xac, 0x2e, 0x9a, 0x99, 0x80, 0x86, 0x21, 0x50, 0x2f},
    {/* K2 */
     0x95, 0xa3, 0xda, 0x06, 0x53, 0x3d, 0xdb, 0x58, 0x5d, 0x35, 0x33, 0x01, 0x0c, 0x42, 0xa0, 0xd9}};
static const unsigned char aes_256_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_AES_BLOCK_SIZE] = {
    {/* Example #1 */
     0x02, 0x89, 0x62, 0xf6, 0x1b, 0x7b, 0xf8, 0x9e, 0xfc, 0x6b, 0x55, 0x1f, 0x46, 0x67, 0xd9, 0x83},
    {/* Example #2 */
     0x28, 0xa7, 0x02, 0x3f, 0x45, 0x2e, 0x8f, 0x82, 0xbd, 0x4b, 0xf2, 0x8d, 0x8c, 0x37, 0xc3, 0x5c},
    {/* Example #3 */
     0x15, 0x67, 0x27, 0xdc, 0x08, 0x78, 0x94, 0x4a, 0x02, 0x3c, 0x1f, 0xe0, 0x3b, 0xad, 0x6d, 0x93},
    {/* Example #4 */
     0xe1, 0x99, 0x21, 0x90, 0x54, 0x9f, 0x6e, 0xd5, 0x69, 0x6a, 0x2c, 0x05, 0x6c, 0x31, 0x54, 0x10}};
#endif /* MBEDTLS_AES_C */

#if defined(MBEDTLS_DES_C)
/* Truncation point of message for 3DES CMAC tests  */
static const unsigned int des3_message_lengths[NB_CMAC_TESTS_PER_KEY] = {0, 16, 20, 32};

/* CMAC-TDES (Generation) - 2 Key Test Data */
static const unsigned char des3_2key_key[24] = {
    /* Key1 */
    0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
    /* Key2 */
    0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xEF, 0x01,
    /* Key3 */
    0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef};
static const unsigned char des3_2key_subkeys[2][8] = {
    {/* K1 */
     0x0d, 0xd2, 0xcb, 0x7a, 0x3d, 0x88, 0x88, 0xd9},
    {/* K2 */
     0x1b, 0xa5, 0x96, 0xf4, 0x7b, 0x11, 0x11, 0xb2}};
static const unsigned char des3_2key_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_DES3_BLOCK_SIZE] = {
    {/* Sample #1 */
     0x79, 0xce, 0x52, 0xa7, 0xf7, 0x86, 0xa9, 0x60},
    {/* Sample #2 */
     0xcc, 0x18, 0xa0, 0xb7, 0x9a, 0xf2, 0x41, 0x3b},
    {/* Sample #3 */
     0xc0, 0x6d, 0x37, 0x7e, 0xcd, 0x10, 0x19, 0x69},
    {/* Sample #4 */
     0x9c, 0xd3, 0x35, 0x80, 0xf9, 0xb6, 0x4d, 0xfb}};

/* CMAC-TDES (Generation) - 3 Key Test Data */
static const unsigned char des3_3key_key[24] = {
    /* Key1 */
    0x01, 0x23, 0x45, 0x67, 0x89, 0xaa, 0xcd, 0xef,
    /* Key2 */
    0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01,
    /* Key3 */
    0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, 0x01, 0x23};
static const unsigned char des3_3key_subkeys[2][8] = {
    {/* K1 */
     0x9d, 0x74, 0xe7, 0x39, 0x33, 0x17, 0x96, 0xc0},
    {/* K2 */
     0x3a, 0xe9, 0xce, 0x72, 0x66, 0x2f, 0x2d, 0x9b}};
static const unsigned char des3_3key_expected_result[NB_CMAC_TESTS_PER_KEY][MBEDTLS_DES3_BLOCK_SIZE] = {
    {/* Sample #1 */
     0x7d, 0xb0, 0xd3, 0x7d, 0xf9, 0x36, 0xc5, 0x50},
    {/* Sample #2 */
     0x30, 0x23, 0x9c, 0xf1, 0xf5, 0x2e, 0x66, 0x09},
    {/* Sample #3 */
     0x6c, 0x9f, 0x3e, 0xe4, 0x92, 0x3f, 0x6b, 0xe2},
    {/* Sample #4 */
     0x99, 0x42, 0x9b, 0xd0, 0xbF, 0x79, 0x04, 0xe5}};

#endif /* MBEDTLS_DES_C */

#if defined(MBEDTLS_AES_C)
/* AES AES-CMAC-PRF-128 Test Data */
static const unsigned char PRFK[] = {
    /* Key */
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0xed, 0xcb};

/* Sizes in bytes */
static const size_t PRFKlen[NB_PRF_TESTS] = {18, 16, 10};

/* Message */
static const unsigned char PRFM[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
                                     0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13};

static const unsigned char PRFT[NB_PRF_TESTS][16] = {
    {0x84, 0xa3, 0x48, 0xa4, 0xa4, 0x5d, 0x23, 0x5b, 0xab, 0xff, 0xfc, 0x0d, 0x2b, 0x4d, 0xa0, 0x9a},
    {0x98, 0x0a, 0xe8, 0x7b, 0x5f, 0x4c, 0x9c, 0x52, 0x14, 0xf5, 0xb6, 0xa8, 0x45, 0x5e, 0x4c, 0x2d},
    {0x29, 0x0d, 0x9e, 0x11, 0x2e, 0xdb, 0x09, 0xee, 0x14, 0x1f, 0xcf, 0x64, 0xc0, 0xb7, 0x2f, 0x3d}};
#endif /* MBEDTLS_AES_C */

static int cmac_test_subkeys(
    int verbose,
    const char* testname,
    const unsigned char* key,
    int keybits,
    const unsigned char* subkeys,
    mbedtls_cipher_type_t cipher_type,
    int block_size,
    int num_tests)
{
    int i, ret = 0;
    mbedtls_cipher_context_t ctx;
    const mbedtls_cipher_info_t* cipher_info;
    unsigned char K1[MBEDTLS_CIPHER_BLKSIZE_MAX];
    unsigned char K2[MBEDTLS_CIPHER_BLKSIZE_MAX];

    cipher_info = mbedtls_cipher_info_from_type(cipher_type);
    if (cipher_info == NULL) {
        /* Failing at this point must be due to a build issue */
        return (MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE);
    }

    for (i = 0; i < num_tests; i++) {
        if (verbose != 0)
            mbedtls_printf("  %s CMAC subkey #%u: ", testname, i + 1);

        mbedtls_cipher_init(&ctx);

        if ((ret = mbedtls_cipher_setup(&ctx, cipher_info)) != 0) {
            if (verbose != 0)
                mbedtls_printf("test execution failed\n");

            goto cleanup;
        }

        if ((ret = mbedtls_cipher_setkey(&ctx, key, keybits, MBEDTLS_ENCRYPT)) != 0) {
            if (verbose != 0)
                mbedtls_printf("test execution failed\n");

            goto cleanup;
        }

        ret = cmac_generate_subkeys(&ctx, K1, K2);
        if (ret != 0) {
            if (verbose != 0)
                mbedtls_printf("failed\n");

            goto cleanup;
        }

        if ((ret = memcmp(K1, subkeys, block_size)) != 0 || (ret = memcmp(K2, &subkeys[block_size], block_size)) != 0) {
            if (verbose != 0)
                mbedtls_printf("failed\n");

            goto cleanup;
        }

        if (verbose != 0)
            mbedtls_printf("passed\n");

        mbedtls_cipher_free(&ctx);
    }

    ret = 0;
    goto exit;

cleanup:
    mbedtls_cipher_free(&ctx);

exit:
    return (ret);
}

static int cmac_test_wth_cipher(
    int verbose,
    const char* testname,
    const unsigned char* key,
    int keybits,
    const unsigned char* messages,
    const unsigned int message_lengths[4],
    const unsigned char* expected_result,
    mbedtls_cipher_type_t cipher_type,
    int block_size,
    int num_tests)
{
    const mbedtls_cipher_info_t* cipher_info;
    int i, ret = 0;
    unsigned char output[MBEDTLS_CIPHER_BLKSIZE_MAX];

    cipher_info = mbedtls_cipher_info_from_type(cipher_type);
    if (cipher_info == NULL) {
        /* Failing at this point must be due to a build issue */
        ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE;
        goto exit;
    }

    for (i = 0; i < num_tests; i++) {
        if (verbose != 0)
            mbedtls_printf("  %s CMAC #%u: ", testname, i + 1);

        if ((ret = mbedtls_cipher_cmac(cipher_info, key, keybits, messages, message_lengths[i], output)) != 0) {
            if (verbose != 0)
                mbedtls_printf("failed\n");
            goto exit;
        }

        if ((ret = memcmp(output, &expected_result[i * block_size], block_size)) != 0) {
            if (verbose != 0)
                mbedtls_printf("failed\n");
            goto exit;
        }

        if (verbose != 0)
            mbedtls_printf("passed\n");
    }
    ret = 0;

exit:
    return (ret);
}

#if defined(MBEDTLS_AES_C)
static int test_aes128_cmac_prf(int verbose)
{
    int i;
    int ret;
    unsigned char output[MBEDTLS_AES_BLOCK_SIZE];

    for (i = 0; i < NB_PRF_TESTS; i++) {
        mbedtls_printf("  AES CMAC 128 PRF #%u: ", i);
        ret = mbedtls_aes_cmac_prf_128(PRFK, PRFKlen[i], PRFM, 20, output);
        if (ret != 0 || memcmp(output, PRFT[i], MBEDTLS_AES_BLOCK_SIZE) != 0) {
            if (verbose != 0)
                mbedtls_printf("failed\n");

            return (ret);
        } else if (verbose != 0) {
            mbedtls_printf("passed\n");
        }
    }
    return (ret);
}
#endif /* MBEDTLS_AES_C */

int mbedtls_cmac_self_test(int verbose)
{
    int ret;

#if defined(MBEDTLS_AES_C)
    /* AES-128 */
    if ((ret = cmac_test_subkeys(
             verbose, "AES 128", aes_128_key, 128, (const unsigned char*)aes_128_subkeys, MBEDTLS_CIPHER_AES_128_ECB, MBEDTLS_AES_BLOCK_SIZE,
             NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    if ((ret = cmac_test_wth_cipher(
             verbose, "AES 128", aes_128_key, 128, test_message, aes_message_lengths, (const unsigned char*)aes_128_expected_result,
             MBEDTLS_CIPHER_AES_128_ECB, MBEDTLS_AES_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    /* AES-192 */
    if ((ret = cmac_test_subkeys(
             verbose, "AES 192", aes_192_key, 192, (const unsigned char*)aes_192_subkeys, MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_AES_BLOCK_SIZE,
             NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    if ((ret = cmac_test_wth_cipher(
             verbose, "AES 192", aes_192_key, 192, test_message, aes_message_lengths, (const unsigned char*)aes_192_expected_result,
             MBEDTLS_CIPHER_AES_192_ECB, MBEDTLS_AES_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    /* AES-256 */
    if ((ret = cmac_test_subkeys(
             verbose, "AES 256", aes_256_key, 256, (const unsigned char*)aes_256_subkeys, MBEDTLS_CIPHER_AES_256_ECB, MBEDTLS_AES_BLOCK_SIZE,
             NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    if ((ret = cmac_test_wth_cipher(
             verbose, "AES 256", aes_256_key, 256, test_message, aes_message_lengths, (const unsigned char*)aes_256_expected_result,
             MBEDTLS_CIPHER_AES_256_ECB, MBEDTLS_AES_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }
#endif /* MBEDTLS_AES_C */

#if defined(MBEDTLS_DES_C)
    /* 3DES 2 key */
    if ((ret = cmac_test_subkeys(
             verbose, "3DES 2 key", des3_2key_key, 192, (const unsigned char*)des3_2key_subkeys, MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_DES3_BLOCK_SIZE,
             NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    if ((ret = cmac_test_wth_cipher(
             verbose, "3DES 2 key", des3_2key_key, 192, test_message, des3_message_lengths, (const unsigned char*)des3_2key_expected_result,
             MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_DES3_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    /* 3DES 3 key */
    if ((ret = cmac_test_subkeys(
             verbose, "3DES 3 key", des3_3key_key, 192, (const unsigned char*)des3_3key_subkeys, MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_DES3_BLOCK_SIZE,
             NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }

    if ((ret = cmac_test_wth_cipher(
             verbose, "3DES 3 key", des3_3key_key, 192, test_message, des3_message_lengths, (const unsigned char*)des3_3key_expected_result,
             MBEDTLS_CIPHER_DES_EDE3_ECB, MBEDTLS_DES3_BLOCK_SIZE, NB_CMAC_TESTS_PER_KEY))
        != 0) {
        return (ret);
    }
#endif /* MBEDTLS_DES_C */

#if defined(MBEDTLS_AES_C)
    if ((ret = test_aes128_cmac_prf(verbose)) != 0)
        return (ret);
#endif /* MBEDTLS_AES_C */

    if (verbose != 0)
        mbedtls_printf("\n");

    return (0);
}

#endif /* MBEDTLS_SELF_TEST */

#endif /* MBEDTLS_CMAC_C */
